We propose a photon-sieve hologram (PSH), a novel computer-generated hologram for generating an image with a resolution of the order of the wavelength. The PSH is designed by synthesising many photon sieves. The PSH has a simple structure that consists of pinholes with the same sizes and depths, and it directly generates images without other optical elements such as masks and imaging optical system. It is advantageous for image generation in ultraviolet and x-ray bands, where high-transmittance and high-numerical-aperture optical systems are difficult to build. In this study, we introduce a sparse photon sieve to configure the PSH and describe the principle of image generation and design procedure. We also fabricate PSHs that generate a line image and a broken-line image to demonstrate phase controllability, and skew images for three-dimensional image generation.
A photon-sieve hologram (PSH) is a computer-generated hologram that can generate fine-line images. As a high-resolution image can be projected directly without using a reducing optical system, it can also be used for short-wavelength radiation, such as X-rays. We propose an optimum design method for the PSH so that a high-quality line image can be projected. We optimised straight-line and L-shaped bent-line images using numerical simulation based on vector diffraction theory and conjugate-gradient methods. This optimisation helped homogenise the intensity of the image and remove unwanted side lobes and spots around the image. We also experimentally examined the bent-line image before and after the optimisation to confirm its effect.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.